A submachine gun (SMG) is an automatic carbine, designed to fire pistol cartridges. It combines the automatic fire of a machine gun with the cartridge of a pistol. An assault rifle, in contrast, uses an intermediate-power cartridge with more power than a pistol but less than a standard rifle or battle rifle.

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It is considered to be one of the finest weapons in the world. The single shot is acceptable, comparable to the 6520 pistol, but the burst mode is excellent. The MP9 is easy to control, and can dish out punishment unlike any other firearm in its size category. Consequently, it is highly popular among people requiring a powerful but compact source of firepower with low maintenance requirements. This weapon is vital amongst freelance-mercs as it can spew death at close range. It is an excellent weapon early in the game and can shred unarmored foes. It is very deadly at close range. Ammunition can be found almost anywhere.

This submachine gun filled National Guard arsenals after the Army replaced it with newer weapons. However, the "Grease" gun was simple and cheap to manufacture so there are still quite a few still in use. It's very powerful, but its .45 rounds lack the bonuses of 10mm rounds.

This Thompson M1928 submachine gun is a sinister looking weapon; every time you hold it, you have an urge to put on a fedora hat and crack your knuckles. The Thompson is well-fed by a large 50 round drum magazine. Like the Grease gun, the Thompson is pretty powerful, but fires nondescript .45 rounds.

The Heckler & Koch P90c was just coming into use at the time of the war. The weapon's bullpup layout, and compact design, make it easy to control. The durable P90c is prized for its reliability, and high firepower in a ruggedly-compact package.

This 10mm SMG is most effective at close-range by unleashing a hail of bullets. However, the SMG is next to useless at longer ranges. The SMG simply has too much spread to be of much use beyond close-range combat. Another downfall of the SMG is its ammunition consumption; if ammunition is not properly managed, the SMG can eat through 10mm rounds at alarming speeds. Even so, it's a common weapon that packs a nasty punch; a very valuable thing.

Used by the tribes in Zion Canyon and the Triggermen of The Commonwealth, the .45 Auto SMG is a relatively robust gun that offers heavy firepower. Unfortunately, the result is that this gun requires two hands to operate. Also, the heavy recoil means that this SMG cannot be used by frail individuals and accuracy will suffer in long-distance engagements.

The MP5 H&K is a submachine gun of German design, developed in the 1960s by a team of engineers from the German small arms manufacturer Heckler & Koch GmbH. It's one of the most popular submachine guns, used by law enforcement and militaries all over the world.

The Uzi was designed by Major Uziel Gal in the late 1940s. The prototype was finished in 1950; first introduced to IDF special forces in 1954, the weapon was placed into general issue two years later. The Uzi has found use as a personal defense weapon by rear-echelon troops, officers, artillery troops and tankers, as well as a frontline weapon by elite light infantry assault forces.

The Sten Gun was developed by the British during WWII as a cheap alternative to the more expensive Thompson SMG offered by the Americans. The Sten proved to be extremely reliable and, due to its fairly loose tolerances, could perform in poor conditions much more reliably than ostensibly better weapons.

The MP40 was created during World War II by the German army, who need a compact weapon that provided more firepower than a simple pistol to arm its paratroopers, tank crews and officers. This weapon was immediately so successful that the Army established an ombudsman to all its troops.

The FN P90c was designed by the FN Herstal and just coming into use at the time of the war. The weapon's bullpup layout, and compact design, make it easy to control. The durable P90c is prized for its reliability, and high firepower in a ruggedly-compact package.

It's a jury-rigged 9mm submachine gun with an improvised bayonet built from scrap metals paired in some places with pieces of tissue and crafted in the workshops of Jane's raiders in Carbon MillTexas in 2208.

Manufactured by Rheinmetall AG, this 9mm machinepistol is capable of one-handed use for both single shot and burst attacks. Though it is wildly inaccurate, its potential for loads of short-range damage is high.